From: Christoph Lameter <christoph@lameter.com>
To: Andi Kleen <ak@muc.de>
Cc: Christoph Lameter <clameter@sgi.com>,
linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: page fault fastpath: Increasing SMP scalability by introducing
Date: Sun, 15 Aug 2004 23:55:57 +0000 [thread overview]
Message-ID: <Pine.LNX.4.58.0408151654240.4346@server.home> (raw)
In-Reply-To: <m31xi8dkm2.fsf@averell.firstfloor.org>
On Mon, 16 Aug 2004, Andi Kleen wrote:
> Christoph Lameter <clameter@sgi.com> writes:
>
> > On Sun, 15 Aug 2004, David S. Miller wrote:
> >
> >>
> >> Is the read lock in the VMA semaphore enough to let you do
> >> the pgd/pmd walking without the page_table_lock?
> >> I think it is, but just checking.
> >
> > That would be great.... May I change the page_table lock to
> > be a read write spinlock instead?
>
> That's probably not a good idea. r/w locks are extremly slow on
> some architectures. Including ia64.
I was thinking about a read write spinlock not an readwrite
semaphore. Look at include/asm-ia64/spinlock.h.
The implementations are almost the same. Are you sure
about this?
next prev parent reply other threads:[~2004-08-15 23:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2ttIr-2e4-17@gated-at.bofh.it>
[not found] ` <2tzE4-6sw-25@gated-at.bofh.it>
[not found] ` <2tCiw-8pK-1@gated-at.bofh.it>
2004-08-15 23:53 ` page fault fastpath: Increasing SMP scalability by introducing Andi Kleen
2004-08-15 23:55 ` Christoph Lameter [this message]
2004-08-16 0:12 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Andi Kleen
2004-08-15 13:50 page fault fastpath: Increasing SMP scalability by introducing pte Christoph Lameter
2004-08-15 20:09 ` page fault fastpath: Increasing SMP scalability by introducing David S. Miller
2004-08-15 22:58 ` Christoph Lameter
2004-08-15 23:58 ` David S. Miller
2004-08-16 0:11 ` Christoph Lameter
2004-08-16 1:56 ` David S. Miller
2004-08-16 3:29 ` Christoph Lameter
2004-08-16 6:59 ` Ray Bryant
2004-08-16 15:18 ` Christoph Lameter
2004-08-15 22:38 ` Benjamin Herrenschmidt
2004-08-16 17:28 ` Christoph Lameter
2004-08-17 8:01 ` Benjamin Herrenschmidt
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